Air conditioner mounting



Feb. 11, 1958 R. E. FRANK ET AL 2,822,745

AIR CONDITIONER MOUNTING 4 Filed Jan. 6, 1955 s Sheets-Sheet 1 FIEl INVENTORS Amlmzw E FEM/K s 3 Aka/1E2 W520 w- @JQl/M 461 Arron/er:

Feb. 11, 1958 R. E. FRANK ETAL' 2,822,745

AIR CONDITIONER MOUNTING Filed Jan. 6, 1955 ,3 Sheets-Sheet 2 cP (JR EM :2 wL 51 40 .E 50L l3 INVENTORS {Pm Mira E. RA K svflkcwsk WI BROWN W, hwc? Feb. 11, 1958 R. E. FRANK ET AL 2,822,745

AIR CONDITIONER MOUNTING Filed Jan. 6, 1955 5 Sheets-Sheet 3 5 .KM R Mm M F m. 5 m R 5 N F 4 r u 5 3 m .W 3 m Km 4 Z A. a u u mm/ W 1 llllllll h llllllllll |mm l 1 w .1 L B r P V 2 2 H m B q; Wm l I'll! ww u M: ,R I w 3 m T 8 I m 4 m 1 a it 5 I J 5 m L m: w y: M llllllll M E AMI/Wu I] Fur/II: T- F u w m, a

United States Patent Minneapolis, Minn., Inc., Minneapolis,

and Archer W. Brown, assignors to Frank Refrigeration, Minn., a corporation of Minnesota Application January 6, 1955, Serial No. 480,202 9 Claims. (CI. 98-94) This invention relates to air conditioner mounting and more particularly to a mounting-by which a roomtype air conditioner may be mounted at the upper part of a window provided with guillotine-type windows, transom windows, casement windows and the like, where an appropriate opening can be provided. Window type air conditioners consist usually of a refrigerator assembly having a motor driven compressor for compressing the refrigerating gas, together with a circulating system for such gas, which includes a heat radiator for the compressed gas and a heat absorber (evaporator) which cools the air circulated by the system. The compressed, hot refrigerating gas is sent through the radiator of the system, which dumps the heat to an exterior fluid, and after being cooled, is sent through a reducing valve into an evaporator which, by extracting heat from the surrounding media, serves to refrigerate that media. In the window-type refrigerating unit the evaporator is in the form of a small radiator through which room air, with or without admixture with exterior air, may be circulated. In such window-type air conditioners provision is usually made for drawing some fresh warm air from the exterior of the building though the evaporator section of the refrigerating unit and thence into the room. Sometimes only a portion of the air exterior to the building is drawn in, some of the air that is taken through the evaporator being drawn from the room itself, whereby only a portion of the air that is sent through the evaporator (cooler) is fresh air from outside.

In order to cool the compressed gas, it is necessary to draw into the refrigerator uni-t a certain amount of air from the exterior of the building which, after passing through the radiator, becomes more heated and is again exhausted to the exterior. In this way the heat that is extracted from the interior of the room is finally dumped to the exterior of the building. Various circulating systems are in vogue but, in general, these always require the drawing in of air from the exterior of the building and the exhausting of air to the exterior of the building.

In the circulation above described it frequently occurs that somernoisture is condensed out of the (possibly humid) warm air from the exterior of thebuilding as that air is passed through the evaporating (cooling) section of the. refrigerator, and provision must be made for returning this moisture (liquid) to the exterior of the building without damaging effects to the building interior-or exterior surfaces. Furthermore, it is jdesirableto ,separate as much as possible the infiowing and outgoing streams of air into the refrigerating unit to avoid bypassing. a

Room air conditioners normally have a capacity of /3 to 1 /2 tons of ice-making capacity for twenty-four hours. Consequently, the room air conditioners are comparatively bulky and heavy units. Heretofore s'uchunits have been commonly mounted on the window sill, in such a manner that a portion of the room air conditioner is within the room and, in some instances, a considerable portion may be projected outside the window. In such I mountings the window is adjusted to allow the unit to be mounted. Such mountings of the air conditioner at the window sills are subject to many disadvantages. In the first place, if they are at room level they consequently occupy space which is valuable to the tenant of the room. Additionally, the air conditioning unit to some extent obstructs the view through the window, since it raises the elfective level of the sill. Furthermore, the mountings of such units are subject to the disadvantage that they interfere with window cleaning, which is an essential operation in building maintenance. Finally, when mounted at window level, the cooled air output is blown into the room at a level occupied by the room occupants and such concentrated flow ofcool air may cause discomfort to the occupants. In colder climates such as the northern portion of the United States, the air conditioner unit must be removed so that windows may be closed in winter, necessitating annual removal, storage and reinstallation of costs.

Also the unavoidable projection of standard mounted window air conditioners beyond the building line detracts tom the appearance of office buildings and, in many cities, violates building codes.

It is an object of the present invention to' provide an air-conditioner mounting which avoids the foregoing difficulties. 1

Some attempts have beenv made heretofore to provide for the mounting of window air conditioners at the upper part of the window opening, but these have required bulky frames and supporting devices, and have therefore not met with success.

It is an object of the present invention to provide an improved air conditioner mounting by which the air conditioner may be mounted at the top part of the Window opening. It is another object of the invention to provide an air conditioner mounting which is adaptable to a wide variety of window widths and styles of construction. It is a further object of the invention to provide an air conditioner mounting which may be assembled by inexperienced workmen into a sturdy unit which, as a unit, forms the entire support of the air conditioning unit. It is another object of the invention to provide an air conditioner mounting capable of being attached to window frame constructions of usual type and of widely varying widths, and in a manner such that the air conditioner unit, as a unit, may be completely removed from the mounting and another unit installed readily and without undue disturbance to the tenant of the building.

It is a further object of the invention to provide an improved air conditioner mounting of attractive appearance located at the top of the window and well above eye level. It is another object of the inevntion to provide an air conditioner mounting for double-hung windows, so constructed that the sashes of the double-hung windows may be raised and lowered easily without waste of time for cleaning the windows windows as during wintertime, when theair conditioners are not usually in operation. Another object of 'the invention is to provide an improved air conditioner unit wherein moisture which is inevitably collected in the unit may be readily disposed of without dripping onto the window frame or onto the interior or exterior" surfaces of the building. It is another object of the invention to provide an improved air conditioner unit of attractive appearance which can be installed in existing buildings without modification of the building structure.

It is a further object of this invention to mount the unit at thetop of thewindow where it will have more efficient and effective operation, exhausting the warmair collecting near the ceiling by convection currents and .ireplacinggjt with" cooled fresh air at a high level, which will settle gently and also for closing the l 3 by convection, thus avoiding strong drafts on occupants of the room.

Other and further objects of the invention are those inherent and apparent in the apparatus as described, illustrated and claimed.

To the accomplishment of the foregoing and related ends, this invention then comprises the features hereinafter fully described and particularly pointed out in the claims, the following description setting forth in detail certain illustrative embodiments of the invention, these being indicative, however, of but a few of the various ways in which the principles of the invention may be employed.

The invention is illustrated with reference to the drawings in which Figure l is a vertical elevational view taken of the window opening, from the interior of the building,

and showing the improved air conditioner mounting of the present invention therein installed;

Figure 2 is a horizontal sectional view taken along the line and in the direction of arrows 22 of Figure 1;

Figure 3 is a horizontal sectional view, similar to that of Figure 2, and taken along the line and in the direction of arrows 3--3 of Figure 1;

Figure 4 is a horizontal sectional view of the apparatus from the underside, taken along the line and in the direction of arrows 44 of Figure 1;

Figure 5 is a fragmentary vertical sectional view taken along the line and in the direction of arrows 5-5 of Figure 4;

Figure 6 is a vertical sectional view taken along the line and in the direction of arrows 66 of Figure 2;

Figure 7 is a fragmentary sectional view of the end of the hinged flap of the air conditioner unit taken along the line and in the direction of arrows 7-7 of Figure 3.

Throughout the drawings corresponding numerals refer to the same parts.

Referring to the drawings, the building wall generally designated B (which, in Figure l, is viewed from the inside, as when in a room), is provided with a window opening generally designated W, having an interior decorative framing F around it, including a window sill S. The window is of the double-hung type and is provided with two window sashes, a lower sash SL and an upper sash SU,

each of which is arranged to slide vertically in guides in the window frame as provided at 10, 11 and 12 at the sides of the window framing. It will be noted from the sectional views shown in Figures 2, 3 and 4 that the building illustrated is shown as of frame construction having vertical framing members VP at each side of the window opening, and an exterior sheeting at ES. The exterior portion of the window is provided with a molding EM and the decorative molding F is provided on the inside. The window frame itself is composed of side members 13-13 and a top member, not shown in the drawings, as well as a bottom member somewhat below the interior sill S. All these are standard construction and are merely illustrative of one form of opening in a building.

Other buildings may be constructed otherwise but in all of them there is provided a sturdy window frame or wall construction having an opening of the window framed into it, and it is to this frame that the air conditioner mounting of the present invention is adapted to be fastened. In some instances, the window may be of the casement type or a transom may be provided in the window or through the building wall. The apparatus of this invention with slight adaptations to meet specific conditions is suitable for all such installations. The specific type of window shown in the drawings is therefore merely illustrative of a fairly common installation situation.

As shown in the drawings, the air conditioner mounting is composed of a plurality of frames, here illustrated as a central frame 20, a first right side frame 21, a second right side frame 22, a first left side frame 24, and a second left side frame 25. The central frame 20, can if desired serve asthe shell of the air-conditioner unit itself, thus avoiding the necessity for a separate shell around the unit U. The

first left and right side. frames 21 and 24 must be used in connection with the air conditioner mounting having sidewall air inlets but areoptional where exterior air inlets and outlets are both forwardly facing. The width of these side frames 21 and 24 from side to side may be varied within limits, and either one or both of the second right or left side frames 22 and 25 may be dispensed with or varied in width, by selection of stock sizes, so as to vary the adaptability of the mounting to windows of dilfering widths. It may be pointed out here, that the side frame members 21, 22,24 and 25 may be varied as needed in their horizontal dimensions indicated at 21D for the first right side frame 21, 22D for the second right side frame 22, and the corresponding dimensions 24]) and 25D for the first and second left side frames. Indeed, if desired, the dimensions 21D and 24D may be varied for the same machine, as may the dimensions 22D and 25D. Thus, by having stock widths of side frame members, a wide variety of total widths of the assembly may be provided. By way of illustration, and with reference to Figure 6, a minimum dimension is shown at M1, which includes the central frame 20 and the right and left side frame members 21 and 24, which may be considered, for purposes of illustration, as minimum sizes. This dimension M1 may be varied by varying the width dimensions 21D and 241) of the members 21 and 24. Then, by utilizing only one sec ond side frame member (22 or 24) the width may be increased to the'dimension M2 (which maybe set right 'or left), and which will vary depending upon the width of the first and second side frame members which are selected. Lastly, a maximum M3 may be obtained by utilizing two second side frame members (22 and 24) one at each of the right and the left sides, and again the total dimension M3 may be varied by varying the dimensions of the individual units.

All of the side frame members and the central frame member are sturdily bolted together. Thus the central frame member has a top 20T, a left sidewall 20L, a right sidewall 20R, and a bottom wall 20B. The left and right sidewalls are provided with apertures as at 20D and 20B, through which air from the exterior of the building is permitted to enter, as will be described hereinafter. Inside of the rectangular frame of the central frame member 20 there are provided guide rails at 26-26, near the bottom of the frame, and it is upon these rails that an air conditioner unit of standard design, generallydesignated U in Figure 1, is adapted to be mounted; The air conditioner unit U is slid in on the rails 2626 and, after being bolted, is thus secured in place. This air conditioner unit can, if desired, be merely abase carrying the necessary mechanical and velectrical components, and a front cover, in which case a complete shell around the unit is not needed, the centraiframe 20, in this event, also serving as the shell of the air conditioner U. In other instances the air conditioner will be provided with its own shell, which then slides into the central frame 20, as much as needed in the assembly.

The first right and left side frame members 21 and 24 are a similar pattern. They are open at the front, they have closed bottom, top, side and rear walls, and in the sidewall which is adjacent to the central frame member there is an aperture matching the apertures 20D and 20B of the'central frame members 29. It is noted parenthetically that in this description, the portion of the mounting and of the air-conditioner unit which faces the building wall is called the front, and is the side that is visiblefrom the building exterior. A specific descriptioii of one of these first side frame members will suffice for both. Thus, referring to the side frame member. 21, it will.be noted that it has a top 21T, a bottom 21B, a wall 21L which'is contiguous with the wall 20R of-thecentral framejll, Wall 21L has an aperture in it at 21E which matches the aperture 20E of the cenor leftpattern but otherwise similar.

during assembly of the various members to the'adjacent window frame.

:arefastened together by the bolts 34-34. sembling;operation the central frame and the first tral frame 20. Theleft and right walls of the central frame 20 and the adjacent walls of the first right frame 21 and of the first left frame 24 can be made of perforated or expanded metal throughout so as to allow air to pass freely there through to an inlet of an airconditioner, where such air flow is desired or needed. The outer wall 21R extends into the room a shorter distance than the wall 21L and the back is closed by the wall 21C. There is thus provided a front opening 210 .through'which air from the exterior of the building may enter as indicated by the arrows 2828 and pass through the openings 20E and 21E into the interior of the central frame .20,-where it will then continue through the .standard air conditioner unit U, which per se forms no part of thepresent invention. The first left side frame member 24 is similar, the two being merely of a right However, it may be mentioned again that the dimensions 21D and 24D may bevaried from a minimum sufficient to provide ade- .quate duct space for the air entering via arrows 2828,

to a considerably greater width. Also the dimensions 21D and 24D need not be equal, although for sake of appearance, this is desirable.

The second right side frame member 22 and the sec- 0nd left side'frame member are of generally the same pattern but may be of varying widths. Thus, as will be noted in Figures 2 and 3 respectively, in Figure 2 the member 22 at the right side has a narrower width di- 'mension than does the member 25 at the left side, whereasin Figure 3 the member 22 at the right side has a considerably larger width dimension than the member 25 atthe left side of the same figure. This illustrataes how members of standard similar patterns may be varied for satisfying the varying total width dimensions of the different windows. In general, the member 22 consists of a-front wall 22F, a bottom wall 22B, and side flanges 22L and 22R, and a top flange '22T (see Figure 2 and Figure 3'). These side flanges are essentially sidewalls but do not extend rearwardly to any greater extent than is necessary for fastening purposes. The bottoms are provided with an upturned bolting flange adjacent to the. outer wall of the first left and right side frame members. The members 22 and 25 are thus open at the rear and closed at the front, which permits the easy installation of fastening bolts both into the window frame and into a composite unit.

It will be noted from Figures 1, 2, 3 and 6 that the several frame members 20, 21, 22, 24 and 25 are assembled so that their front portions form a common vertical frontplane shown by the line CD in Figures 2-4, and that their top walls form a common straight and level top fastening surface designated by the line TF in Figures 1 and 6. Likewise, the vertical sidewalls of the outermost of the frames are parallel to and form right and left fastening surfaces respectively, designated RF and LP in Figures 1 and 6, which can be attached We prefer also to make all frames of the same height so the bottom of the assembly will also be level. All of the frames which go to make up the assemblage are fastened sturdily together by;bolts, rivets, welding or other suitable fastenings, and

the assembly as a whole is then fastened to the window ,frameby lugs, screws, bolts or other suitable fastening Lrneans. Thus, referring to Figures 1 and 6, the central frame 20 is attached to the frame 21 by the bolts fall- =-and to'the first left frame 24 by the bolts 3131. The first and second right frames are fastened together by the bolts .32 '32 and the first and second left frames right andleft side frames 21 and 24 are usually bolted together first, and the bolts may easily be reached by reaching through the openings which are available In the asthrough the front of the assembly at the-common yertical front plane Cl... Similarly, the first and second right frames 21 and 22 and the first and second "left frames 24 and 25 may likewise be bolted together by the bolts 32 and 34 respectively by reaching through the front of openings 21 and 24 respectively and the rear of the frames 22 and 25. The appropriate number and width of first and second sideframes which are usedin the assembly are first selected so as to give a total overall dimension M1, M2 or M3 to 'fit the window. When the assembly is bolted together'it is then raised and the fastenings into the window frame are then placed. These fastenings, here illustrated as lag screws 3535', can easilybe reached during the installation operation. The fastenings (which will be varied as to type, to suit the construction of the window frame) and which are along the front of the top 20T of. the central frame 20 can be reached from the rear of the assembly'before the air conditioner unit U is inserted. Then all of those fastenings which extend through the second side frame members 22 and 25 can be reached from the rear, and placed. For fastening the top edges of the firstright and left side frames 21 and 24to the windowjframe, the mech anism can reach through the rear of thecentral unit 20 and then through the openings 20B and 21B, .see Fig. 3. While this is somewhat less convenient than. placing the fasteners in the second side frame member as at 22-24, it can yet be done without undue delay, and in a sturdy manner. The entire assembly may thus be secured in place and will support such usual weights as are common in Window air conditioner units all without undue stress upon the window frame.

Referring to Figures 2 through 5, there areillustrated the vanes which maybe opened or closed andwhich serve to separate the incoming and outgoing air streams through the window opening. Thus,'in the central frame 20, and adjacent the common front vertical plane CI of the assembly, there are two vertical shafts, as at 36R and 36L. These shafts are pivoted in the top and bot tom walls respectively of the frame 20 and also pass through the front portion of the horizontal flange of rails 26 as shown in Figure 5. Above the level of the flange 26 there are mounted the vanes 36, each being solidly attached to its respective shaft so that as the shaft is turned, the vane will likewise be turned. In order to turn the .shaft, it is bent over to a generally right angular position as shownin Figures 4 and 5, thus providing a portion 37 which extends to and adjacent the bottom wall of the central unit 20B, and on the bottom of the assembly there are provided spring clips 38 which serve releasably to secure the handle portions 37 of each of the shafts-36R and 36L. Thus, by grasping the handle portion 37 it may be moved from the dotted line position shown in Figure 4, in which the vanes 36 are open, to-the full line position shown in Figure v4 in which the vanes are closed, that is, in a position parallel to and- Within the room, adjacent the common vertical front plane CP of the assembly.

When it is desired to wash windows or to store the air conditioner during winter seasons, the vanes are closed. At other times, when the air conditioner unit is in service, thevanes are moved to the open position, as shown in dotted lines in Figure 4, and in fulllinesin Figures 2'and 3.

Along thefront of the common bottom wall of the several frames there is fastened a flap, generallydesignated 49. The flap 40 may conveniently be made of rubber sheeting, which is reinforced at its rear edge by a folded-over piece of sheet metal 41, that is in turn secured to the bottoms of the various'frames by means of a row of bolts or screws 42. This allows a portion of the flap tohang free and to pivot about the line. 40T.

' The front portion of the flap is of sufficient Width, so that 7 7 beyond the front face of the upper sash SU, where it bends down a little as shown at 43, to form a drip edge. The portion 44 of the flap may be adjusted, so far as slant is concerned, by adjusting the position of the upper sash SU upon which it rests. The width of the flap, from side to side in respect to the window, is reinforced by a sheet metal reinforcing at 45, which is fastened in place by rivets or staples 46 in several rows. The entire flap 40 may be moved from the full line to the nonhorizontal out-of-the-way position shown in dotted lines in Figure 5, and in such out-of-the-way position of Figure it is just inside of the common vertical plane CP. In this position it may be secured by one or more hooks 48, which are attached to the flap and may be hooked in corresponding eyes 49 on the bottom of the assemblage of frames. If desired, the flap can be swung upwardly to a non-horizontal out-of-the-way position where it can be held in a more or less slanting position against the inner or outer sash, depending upon the condition of the sashes.

When it is desired to wash the windows or to store the air conditioner, or at all other times when it is desired to close the double-hung window to the usual closed position, the flap 40 is swung down and back to the dotted line position shown in Figure 5 and is secured in this position. The vanes 36 are also closed at this time moved to their dotted line position as shown in Figures 3 and 4. The sashes SL and SU may then be operated in their customary manner, being entirely outside of the common vertical plane CP which forms the front of the interior conditioner unit, when in position.

The width of the flap 40 from side to side in respect to the window must be no greater than the interior dimension W of the guides in which the window sashes SL and SU move vertically. The small spaces WR and WL, see Figure 2, which are represented by the side portions of the window sashes embraced by the guides, are therefore not covered by the flap 40. In order to close these spaces, and thereby prevent the dripping or running of water which may be condensed by the air conditioner unit, or strike it as rain or snow, onto the window frames and down along the frames into the building construction, or onto the building walls, interior or exterior, we provide small extension slides 50R and 50L, which may be retracted so as to allow the flap 40 to be swung down, or, when the flap 40 is in its position shown in Figure 5, the extensions 50 may be moved sideways to an extreme position where they enter the spaces WR and WL respectively and close them off. The extensions are made of rectangular pieces of rubber sheet 51 and are cut on the siteso as to neatly fit into the spaces WR and WL and to fit around the middle guide 11 at each side of the window frame. The extensions are reinforced by sheet metal 52, and it is desirable to reinforce the adjacent end portions of the rubber flap 40 by means of upper and lower sheets of metal 5454, which are held in place by rivets 55-55. The composite end of the reinforced flap, composed of the rubber flap 40 and the reinforcement sheet 54-54, is provided with slots at 5656 through which screws 57-57, of the extensions 50L and 50R, are adapted to pass. Each of the screws is provided with a wing nut which, upon being loosened, permits the user to grasp the wing nut and move the extension to project it in the direction of arrow 59, so as to close the space WR, or in the direction of arrow 60, so as to retract the extension from that space, thereby to permit the flap 40 to be swung down. In either position the extension may be locked into place by tightening the wing nuts. The extensions on the right and the left end of the flap 40 are similar and, therefore,

the foregoing description which is of the right end extension will sufiice.

It is apparent that many modifications and variations of this invention as hereinbefore set forth may be made without departing from the spirit and scope thereof. The specific embodiments described are given by way of example only and the invention is limited onlyby the terms of the appended claims.

What we claim is:

l. A mounting for air conditioners which are adapted to be fitted to windows having a window casing therearound comprising an assemblage of rectangular frames, each including vertical sidewalls and top and bottom walls, said frames set in side by side relationship with their top edges forming a common top-fastening surface and their front facing edges in substantially. a common vertical front plane, the side faces of the outermost of said assemblage of frames forming respectively right-side and left-side fastening surfaces, meeting the right and left ends respectively of said top-fastening surface-and said common vertical plane substantially at right angles thereto, said assemblage including a central frame having open front and rear faces and horizontal top and bottom supporting surfaces therein for receiving a'standard window mounted air conditioner unit, said central frame being provided with air openings in the sidewalls thereof, and at least a first right frame and a first left frame fastened at the right and left sides respectively of said central frame, said first right and left side frames being closed except for openings in the walls thereof adjacent to and communicating with said air openings and openings in their front faces, said frames being fastened together along their contiguous surfaces to form a common mounting for the air conditioning unit, said fastening surfaces being provided with apertures for introducing fastening screws or bolts into the side and top faces of the window frame forming the sole atachment of the assemblage to said window frame.

2. The apparatus of claim 1 further characterized in that vane means are pivoted along a vertical axis in the central frame closely adjacent the side walls of the central frame and the vertical front plane thereof.

3. The apparatus of claim 1 further characterized in that an elongated resilient flap is provided along the lower edge of said assemblage adjacent the common vertical front plane, said flap being of a width extending from side- -to-side of the window and hinged along the lower edge of the common vertical front plane so that it may be swung to a non-horizontal out-of-the-way position or hori-' zontally outwardly beyond said common vertical front plane.

4. The apparatus of claim 3 further characterized in that at each side edge of the flap there are underside of the flap for moving said extensions toward the sides of the window frame for filling the space between the window frame guides when the slides are extended and for retracting said extensions sufficiently to- 5. The apparatus of claim 4 further characterized in that means is provided on the assemblage and the flap for detachably securing the latter when swung to an outof-the-way non-horizontal position.

6. The apparatus of claim 1 further characterized in that in addition to the central frame, there are provided a second right-side frame and a second left-side frame, all firmly secured'together to the first right and left side frames respectively, and means closing each of said frames.

7. The apparatus of claim 6 further characterized in that the first and second side frames at one side of the assemblage are of unequal width from side-to-side.

8. The apparatus of claim 6 further characterized in that the total side-to-side width of the side frames at one side of the central frame is different than the total sidecentral frame.

provided end-- wise slidable extensions having operating means on the 9. The apparatus of claim 6 further characterized in References Cited in the file of this patent that the second right-side f rame and second left-side UNITED STATES PATENTS frame has a front closure ad acent sa1d common vertlcal front plane and is open at the rear to provide for ready 1,938,797 Boume 19,33 admission of fastening screws through the sidewalls there- 5 2433'104 Eberhart 23, 1947 of.

S. DEPARTMENT OF COMMERCE PATENT-OFFICE v CERTIFICATE OF CORRECTION Patent No., 2,822,745 Richard E, Frank et all February 11, 1958 It is hereby certified that error appears in the printed specification of the above numbered patent requiring correction and that the said Let oers Patent should read as corrected below.

Column 1, line 37, for "though" read through column 2-, line 52, for "inevntion" read inventio column 6, lines 23-24, for mechazmlsm read mechanic column 8, line 34, for atachmenfiu" read attachment Signed and sealed this 3rd day of June 1958.

(SEAL) Attest:

KARL AXLINE ROBERT C. WATSON Atteeting Officer Conlniuioner of Patent: 

